Postal worker Cheryl Bailey, 54, sorts through letters addressed to Santa Claus at the post office in Santa Claus, Indiana, U.S., December 10, 2021. More than 20,000 letters addressed to Santa Claus arrive at the post office in Santa Claus each year. REUTERS/Cheney Orr 

Postal worker Cheryl Bailey, 54, sorts through letters addressed to Santa Claus at the post office in Santa Claus, Indiana, U.S., December 10, 2021. More than 20,000 letters addressed to Santa Claus arrive at the post office in Santa Claus each year. REUTERS/Cheney Orr 

A United States Postal Service (USPS) worker sorts packages in his truck in the Manhattan borough of New York City, New York, U.S., August 17, 2020. REUTERS/Carlo Allegri 

A United States Postal Service (USPS) worker sorts packages in his truck in the Manhattan borough of New York City, New York, U.S., August 17, 2020. REUTERS/Carlo Allegri 

A United States Postal Service (USPS) worker sorts packages in his truck in the Manhattan borough of New York City, New York, U.S., August 17, 2020. REUTERS/Carlo Allegri 

A United States Postal Service (USPS) worker sorts packages from his truck in the Manhattan borough of New York City, New York, U.S., August 17, 2020. REUTERS/Carlo Allegri 

A post office harvests vegetables at a 900 square meters farm garden on the rooftop of a postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employee harvest vegetables on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. The slogan reads " To make dreams grow". Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees harvests vegetables on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees work on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees work on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees work on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Poste office employees eat a lunch with products from a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees work on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Poste office employees eat a lunch with products from a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees work on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. The slogan reads "to grow vegetables on the rooftop of the post office is to grow dreams." Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees pose on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees pose on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Post office employees pose on a 900 square meters farm garden on the rooftop of their postal sorting center, as part of a project by Facteur Graine (Seed Postman) association to transform a city rooftop as a vegetable garden to grow fruits, vegetables, aromatic and medicinal plants, with also chickens and bees in Paris, France, September 22, 2017. Picture taken September 22, 2017. REUTERS/Charles Platiau 

Disused rail cars sit in the 'train graveyard' in tunnels near the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A control panel of a battery-operated train is seen on the Mail Rail tracks at the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

Signs are seen in a tunnel near the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A museum worker sits in a battery-powered train on the Mail Rail tracks of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A disused rail car sits on the Mail Rail tracks of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

Mail Rail train tracks are seen near the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A Mail Rail sign is seen above the tracks of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

Mail Rail train tracks are seen near the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A mural painted by postal workers is seen on the wall of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

Adrian Steel, Director of The Postal Museum, poses for a photograph on the platform of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A dartboard used by postal workers is seen on the wall of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

Adrian Steel, Director of The Postal Museum, poses for a photograph on the platform of the Mount Pleasant Sorting Office underground station in London, Britain, August 7, 2017. REUTERS/Hannah McKay 

A postwoman of the German postal and logistics group Deutsche Post sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

A postman of the German postal and logistics group Deutsche Post sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Sabine Standke, 32-year-old postwoman of the German postal and logistics group Deutsche Post, sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Sabine Standke, 32-year-old postwoman of the German postal and logistics group Deutsche Post, counts letters at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Letters are pictured in a sorting office of the German postal and logistics group Deutsche Post in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Sabine Standke, 32-year-old postwoman of the German postal and logistics group Deutsche Post, sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Sabine Standke, 32-year-old postwoman of the German postal and logistics group Deutsche Post, pushes a trolley with mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Transport boxes are pictured next to a postman of the German postal and logistics group Deutsche Post who is sorting mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

A postwoman of the German postal and logistics group Deutsche Post sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group, transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Sabine Standke, 32-year-old postwoman of the German postal and logistics group Deutsche Post, sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Sabine Standke, 32-year-old postwoman of the German postal and logistics group Deutsche Post, sorts mail at a sorting office in Berlin's Mitte district, December 4, 2013. Deutsche Post, the world's number one postal and logistics group transported around 18 billion letters in 2012. REUTERS/Fabrizio Bensch (GERMANY - Tags: BUSINESS EMPLOYMENT) 

Paint peels on Royal Mail post boxes outside a sorting office in Altrincham, northern England September 12, 2013. Britain embarked on its largest privatisation in decades on Thursday as the government unveiled plans to sell the majority of the near 500-year-old state-owned Royal Mail postal service. The Department for Business said a stock market flotation would take place in coming weeks, giving the public a chance to buy into the postal network. Ten percent of the shares will be given to Royal Mail staff.REUTERS/Phil Noble (BRITAIN - Tags: BUSINESS POLITICS) 

Postal worker Kanjarian Maganlal, who has worked at the Post Office for 23 years, sorts letters at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

Sorted parcels are seen at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. . Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

A postal worker helps run an intelligent sorting machine at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

Postal worker Jess Kaur, who has worked at the Post Office for 13 years, sorts parcels at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

Postal worker Jess Kaur, who has worked at the Post Office for 13 years, sorts parcels at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

Postcards are sorted at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

Postal worker Sumi Piramakumar, who has worked at the Post Office for 20 years, sorts letters at Mount Pleasant sorting office in London July 26, 2013. After three aborted privatisation attempts in 19 years, Britain's Royal Mail postal service looks closer than ever to a sale that would end almost five centuries of ties to the state. Photograph taken on July 26, 2013. REUTERS/Olivia Harris (BRITAIN - Tags: BUSINESS POLITICS) 

Royal Mail postman Donnie Macdonald sorts mail at a sorting office in Highland Perthshire, Scotland July 26, 2013. REUTERS/Russell Cheyne (BRITAIN - Tags: BUSINESS EMPLOYMENT) 

Postal clerk Jarron Webster sorts newly arrived packages for delivery in the U.S. post office at RAF Alconbury, near Huntingdon, central England June 11, 2013. The U.S. Air Force controlled RAF Alconbury opened in 1938 and remains a small pocket of American life nestled in the heart of the English countryside. Picture taken June 11, 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY MILITARY) 

Postal clerk Arin Vickers sorts mail for delivery in the U.S. post office at RAF Alconbury, near Huntingdon, central England June 11, 2013. The U.S. Air Force controlled RAF Alconbury opened in 1938 and remains a small pocket of American life nestled in the heart of the English countryside. Picture taken June 11, 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SOCIETY MILITARY TPX IMAGES OF THE DAY) 

United States Postal Service (USPS) Letter Carrier Lakesha Dortch-Hardy smiles as she sorts mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. The USPS, which relies on the sale of stamps and other products rather than taxpayer dollars, has been grappling for years with high costs and tumbling mail volumes as consumers communicate more online. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT) 

United States Postal Service (USPS) Letter Carrier Lakesha Dortch-Hardy sorts mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. The USPS, which relies on the sale of stamps and other products rather than taxpayer dollars, has been grappling for years with high costs and tumbling mail volumes as consumers communicate more online. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT) 

United States Postal Service (USPS) Letter Carrier Lakesha Dortch-Hardy sorts mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. The USPS, which relies on the sale of stamps and other products rather than taxpayer dollars, has been grappling for years with high costs and tumbling mail volumes as consumers communicate more online. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT) 

United States Postal Service (USPS) Letter Carrier Lakesha Dortch-Hardy sorts mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. The USPS, which relies on the sale of stamps and other products rather than taxpayer dollars, has been grappling for years with high costs and tumbling mail volumes as consumers communicate more online. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT) 

United States Postal Service Letter Carrier Lakesha Dortch-Hardy sorts mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. The USPS, which relies on the sale of stamps and other products rather than taxpayer dollars, has been grappling for years with high costs and tumbling mail volumes as consumers communicate more online. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT) 

United States Postal Service Letter (USPS) Carrier Lakesha Dortch-Hardy loads her van with mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT) 

United States Postal Service (USPS) Letter Carrier Lakesha Dortch-Hardy sorts mail at the Lincoln Park carriers annex in Chicago, November 29, 2012. The USPS, which relies on the sale of stamps and other products rather than taxpayer dollars, has been grappling for years with high costs and tumbling mail volumes as consumers communicate more online. REUTERS/John Gress (UNITED STATES - Tags: SOCIETY BUSINESS EMPLOYMENT)